and many others ...
The code uses the information obtained in the main0 module, this is
mostly done via the get_params_1a()
call, that obtains parameters of the type
t_params
and passes them to local variables
M a i n
s u b r o u t i n e
r e g a r d i n g
t h e
c a l c u l a t i o n
o f
t h e
m a t r i x